It is assumed that an appropriate type of head armoring will be added to the suit of armor in order to allow uniform protection of the wearer. Wearing of a "great helm" odds the appropriate weight and restricts vision to the front 60" only, but it gives the head AC 1. If a helmet is not worn, 1 blow in 6 will strike at the AC 10 head, unless the opponent is intelligent, in which case 1 blow in 2 will be aimed at the AC 10 head (d6, 1-3 = head blow) (AD&D 1e DMG)What are the odds of striking the head if a helmet IS worn? 1 in 6? Seems like it. I mean, the AC is given for a great helm in the example.
That would mean that every attack by the PCs required an extra d6 roll to determine if the head was a target or not. Not bloody likely to happen.
Was there a similar rule in previous editions (OD&D, B/X) or later editions (BECMI / 2e)?
I still prefer +Joe D 's house rules from Blood Island.